This view of the twilight sky and Martian horizon taken by NASA's Curiosity Mars rover includes Earth as the brightest point of light in the night sky. Earth is a little left of center in the image, and our moon is just below Earth.

This frame from an animation from NASA's Mars rover Curiosity shows the rover drilling into rock target 'Cumberland.' The drilling was performed during the 279th Martian day, or sol, of the Curiosity's work on Mars (May 19, 2013).

This image from the Mars Hand Lens Imager on NASA's Mars rover Curiosity shows the patch of rock cleaned by the first use of the rover's Dust Removal Tool (DRT). The tool is a motorized, wire-bristle brush on the turret at the end of the rover's arm.

The two bodies in this portion of an evening-sky view by NASA's Mars rover Curiosity are Earth and Earth's moon. The rover's Mast Camera (Mastcam) imaged them in the twilight sky of Curiosity's 529th Martian day, or sol (Jan. 31, 2014).

NASA's Mars rover Curiosity used its Mast Camera (Mastcam) to take the images combined into this mosaic of the drill area, called 'John Klein,' where the rover ultimately performed its first sample drilling.

This rectangular version of a self-portrait of NASA's Mars rover Curiosity combines dozens of exposures taken by the rover's Mars Hand Lens Imager (MAHLI) during the 177th Martian day, or sol, of Curiosity's work on Mars (Feb. 3, 2013).

The rover is positioned at a patch of flat outcrop called 'John Klein,' which was selected as the site for the first rock-drilling activities by NASA's Curiosity. This self-portrait was acquired to document the drilling site.

After an activity called the 'mini drill test' by NASA's Mars rover Curiosity, the rover's MAHLI camera recorded this view of the results. The test generated a ring of powdered rock for inspection in advance of the rover's first full drilling.

The bit in the rotary-percussion drill of NASA's Mars rover Curiosity left its mark in a target patch of rock called 'John Klein' during a test on Feb. 2, 2013, in preparation for the first drilling of a rock by the rover.

This head-on view shows the tip of the drill bit on NASA's Mars rover Curiosity. The view merges two exposures taken by the remote micro-imager in the rover's ChemCam instrument at different focus settings.

The shape of the tip of the bit in the drill of NASA's Mars rover Curiosity is apparent in this view recorded by the remote micro-imager in the rover's ChemCam instrument on Mars. Jan. 29, 2012; the bit is about 0.6 inch (1.6 centimeters) wide.

The percussion drill in the turret of tools at the end of the robotic arm of NASA's Mars rover Curiosity has been positioned in contact with the rock surface in this image from the rover's front Hazard-Avoidance Camera (Hazcam).

First Night Image of MAHLI Calibration Target Under Ultraviolet Lights

Illumination in this image comes from MAHLI's two ultraviolet LEDs, which emit light in a waveband centered at a wavelength of 365 nanometers in this image of a calibration target on NASA's Mars rover Curiosity.

MAHLI's First Night Imaging of Martian Rock Under Ultraviolet Lighting

This image of a Martian rock dubbed 'Sayunei' is illuminated by ultraviolet LEDs (light emitting diodes) is part of the first set of nighttime images taken by the Mars Hand Lens Imagery camera at the end of the robotic arm of NASA's Mars rover Curiosity.

This image maps the traverse of NASA's Mars rover Curiosity from 'Bradbury Landing' to 'Yellowknife Bay,' with an inset documenting a change in the ground's thermal properties with arrival at a different type of terrain.

From a position in the shallow 'Yellowknife Bay' depression, NASA's Mars rover Curiosity used its right Mast Camera (Mastcam) to take the telephoto images combined into this panorama of geological diversity.